JPS63243556A - Emergency control device for hydraulically controlled clutch transmission - Google Patents

Abstract

PURPOSE:To enable self-propelling in case of emergency by controlling hydraulic pressure manually after pressure required for the operation of a clutch transmission is secured with a relief passage closed to the low pressure side when the electric control system of the subject device fails. CONSTITUTION:When an electric control system fails, a manual clutch control valve 24 is actuated manually so as to close a clutch hydraulic control valve 5, thereby checking the relief from a relief passage 17 and a cut-off poppet valve 14 to the low pressure side for securing the pressure in pressure oil feeding passages 2 and 3. Then when the valve 24 is actuated to an increase position, the passage 17 is closed allowing a hydraulic control valve 25 which effects an operation equivalent to that of an electromagnetic pressure control valve 16, to be communicated with the control valve 5. And the control valve 25 is communicated with a passage 26 so as to control the valve 5, the switching of the cut-off poppet valve 14 is controlled so as to apply pressure to a clutch connection chamber 11 for controlling the engagement and disengagement of the clutch. While a manual transmission control valve 27 is manually actuated for effecting the shift to a first gear position and a reverse gear position by means of a selecting cylinder 30.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an emergency control device for a hydraulically controlled clutch transmission.

<Prior Art> There is a device that automatically controls the clutch and transmission of an automobile using hydraulic pressure. The mechanism divides the pressure oil discharged from the oil pump into the clutch control cylinder side and the transmission control cylinder side, and on the clutch side, the pressure oil is selectively supplied to the clutch disconnection chamber side and the clutch connection side chamber. It is equipped with a switching valve, a clutch hydraulic control valve that switches and controls this switching valve, and an electromagnetic pressure control valve that controls this clutch control valve, and on the transmission side, the pressure oil is supplied to a select cylinder and a shift cylinder, respectively. It is equipped with an electromagnetic control valve to discharge the air.

<Problems to be Solved by the Invention> In the above device, if a failure occurs in the electrical control system, the electromagnetic pressure control valve on the clutch side and the electromagnetic control valve on the transmission side will become inoperable, and the electromagnetic pressure control valve on the transmission side will become inoperable. Since the electromagnetic control valve is a type that opens when energized, pressure oil will not be relieved to the low pressure side even if the electrical control system fails, but the electromagnetic pressure control valve on the clutch side Since the relief passage to the low pressure side is throttle-controlled according to the value, if the electric control system fails, the relief passage becomes fully open and the clutch pressure control valve is opened. Therefore, the pressure oil discharged from the oil pump is relieved to the lower pressure side than the relief passage and the switching valve, so the pressure of the pressure oil on the clutch side and transmission side decreases, reducing the pressure necessary for the operation of the clutch and transmission. cannot be preserved.

In the event that the electric ff1ll N system fails, the present invention provides
The present invention provides an emergency control device that closes the relief passage to the low pressure side, maintains the pressure necessary for the operation of the clutch and transmission, and then manually controls the pressure oil and enables self-transport.

Means for Solving the Problems> In order to solve the above problems, the present invention divides the pressure oil discharged from the oil pump into the clutch control cylinder side and the transmission control cylinder side. On the side, there is a switching valve that selectively supplies the pressure oil to the clutch disconnecting chamber side and the clutch connecting chamber side of the clutch control cylinder, a clutch hydraulic control valve that switches and controls this switching valve, and a clutch hydraulic control valve that controls this switching valve. Equipped with an electromagnetic pressure control valve,
In a hydraulically controlled clutch transmission, the transmission side is equipped with an electromagnetic control valve that supplies and discharges the pressure oil to the select cylinder and the shift cylinder, respectively, and the clutch side has the clutch hydraulic control valve that opens and closes the clutch hydraulic control valve,
A clutch manual control valve for switching and controlling the switching valve is provided, and at least a clutch manual control valve is provided on the transmission side between the pressure oil supply passage from the oil pump and the pressure oil supply and discharge passages of the selection cylinder and the shift cylinder. It is equipped with a manual control valve for the transmission that changes gears between the first gear position and the reverse gear position.

Function> In the event that the electric control system malfunctions, the clutch manual control valve is manually operated, the clutch hydraulic control valve is closed, and the pressure of the pressure oil discharged from the oil pump is secured. Then, the switching valve is controlled to disengage the clutch.
In addition, manually operate the manual control valve for the transmission to select at least 1st gear position and reverse gear position.

It is a shift.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. 1 is an oil pump, 33 is a flow rate regulating valve that maintains a constant flow rate of the pressure oil discharged from the oil pump 1, and 34 is a filter. Pressure oil discharged from the oil pump l is divided into a pressure oil supply passage 2 to the clutch side hole and a pressure oil supply passage 3 to the transmission side TM. 4 is an electromagnetic switching valve.

The clutch side CL has a clutch control cylinder 8. This clutch control cylinder 8 is connected by a piston 9 to a clutch disconnecting side chamber 10 and a clutch connecting side chamber 1.
1 is formed, and both chambers 10. II is communicated via an orifice 12 provided in the piston 9.

The circuit configuration for controlling the supply of pressure oil to the clutch control cylinder 8 is as follows. A circuit 6 communicates from the pressure oil supply passage 2 with the clutch disconnection side chamber 10 via the clutch oil pressure control valve 5, and a circuit 6 communicates with the clutch connection side chamber 11 from the pressure oil supply passage 2 through the check valve 13 and the switching valve 14. It has a circuit 15 that communicates with it, and an electromagnetic pressure control valve 16 arranged in a relief passage 17 communicating with the low pressure side for controlling the clutch oil pressure control valve 5, and the circuit 6 has a clutch disconnection side chamber 1.
0 and a back pressure valve 7 that always controls and supplies pressurized oil at a constant pressure.

On the other hand, the transmission side T has a selection cylinder 30 that selects and operates the transmission, and a shift cylinder 2 that operates a shift, and supplies pressure oil from the pressure oil supply passage 3 to the selection cylinder 20. , and electromagnetic select valves VA, VB, VC that discharge to the low pressure side
and electromagnetic shift valves VD and VE that supply the shift cylinder 21 and discharge to the low pressure side. To this electromagnetic select valve V, VB, VC and electromagnetic shift valve Vl)
, VE has a structure in which a ball valve 22 is opened once when a current is applied to the solenoid, and a discharge passage 23 leading to the low pressure side is opened when no current is applied to the solenoid.

32 is a relief passage that communicates the pressure oil supply passage 3 to the low pressure side, and 31 is a relief passage 31 that opens and closes this relief passage 32 during gear shifting to control the pressure inside the pressure oil supply passage 3, especially when shifting suddenly. This is an electrohydraulic control valve that slows down the shift force and performs a smooth shift operation.

In the present invention, in the above structure, a clutch manual control valve 24 is provided on the clutch side CL, and a transmission manual control valve 27 is provided on the transmission side TH.

The clutch manual control valve 24 is a switching valve 1 between the clutch hydraulic control valve 5 and the electromagnetic pressure control valve 16.
It is placed in relation to 4. That is, the clutch oil pressure control valve 5 and the valve part that opens and closes the relief passage 17 of the electromagnetic pressure control valve 16, and the pressure oil supply passage 2 before the check valve 13 through the passage 18 to the switching valve 14 on the right side in the figure. A constant signal pressure, which is supplied from the circuit 6 through the passage 20 to the operation boat on the left side in the drawing of the switching valve 14, is connected to the valve part that opens and closes the passage 19 connected to the operation port of the switch valve 14. The hydraulic pressure control valve 25 has the same function as the electromagnetic pressure control valve 16.

In addition, manual control valve 2 for transmission
7 is arranged between the electromagnetic select valves VA, VB, VC and the electromagnetic shift valves VD, VE and the selection cylinder 20 and shift cylinder 21 via the following passage structure.

The electromagnetic select valve VA is connected to the boat CA of the selection cylinder 20 via the passage 28A, and the electromagnetic select valve VB
is the passage 288, which is connected to the boat CB via the manual control valve 27 for the transmission, and the electromagnetic select valve V.
C is connected to the boat CC via a passage 28B and a manual control valve 27 for the h-transmission.

Further, the electromagnetic shift valve v0 is connected to the passage 28111. The electromagnetic shift valve VE is connected to the boat CD of the shift cylinder 21 via the transmission manual control valve 27, and the electromagnetic shift valve VE is connected to the boat CE of the shift cylinder 21 via the transmission manual control valve 27.
It is connected to the.

In addition, manual control valve 2 for transmission
A passage 2 that directly supplies pressure oil from the pressure oil supply passage 3 to the boat CB of the selection cylinder 20 according to the operating position of 7.
9B, a passage 29C supplying the boat CC, and further,
Passage 29 that supplies the boat CD of the shift cylinder 21
D, and a passage 29E that supplies the boat CE.

Next, the operation of the above configuration will be explained. First, normally, the clutch manual control valve 24 opens the relief passage 17 between the clutch hydraulic control valve 5 and the electromagnetic pressure control valve 16, and brings the passages 18 and 19 into communication.
The relief circuit of the passage 26 and the pressure oil control valve 25 is closed. As a result, the electromagnetic pressure control valve 16 is actuated to control the clutch hydraulic pressure control valve 5, and the switching valve 14 is controlled to switch under the control of the clutch hydraulic pressure control valve 5, so that the clutch disconnection side chamber lO is supplied to the clutch connection side chamber 11. The clutch is engaged by supplying pressurized oil at a certain pressure or higher, and the clutch is disengaged by relieving this supplied pressurized oil to the low pressure side by the switching valve 14.

On the other hand, transmission manual control valve 2
7 opens all the passages 28B to 28H and opens the passage 298.
~28E are all closed. Therefore, by opening and closing the electromagnetic select valve VA-VC, the select cylinder 20
performs select operation, and also operates electromagnetic shift valves VD and VE.
The shift cylinder 21 performs a shift operation by opening and closing operations.

If a failure occurs in the electrical control system for some reason, the electromagnetic pressure control valve 16 is controlled by an electrical signal. The electromagnetic select valves VA-VC and electromagnetic shift valves VD, VE, etc. become uncontrollable. Furthermore, the relief passage 17 is fully opened due to the electromagnetic pressure control valve 16 being uncontrollable, and the clutch hydraulic pressure control valve 5
is in an open state, so the pressure in the pressure oil supply passage 2.3 drops.

Therefore, first, the clutch manual control valve 24
is manually operated and moved downward from the neutral position shown in the figure to close the clutch hydraulic control valve 5 and prevent relief from the relief passage 17 and the switching valve 14 to the low pressure side, thereby reducing the pressure in the pressure oil supply passages 2 and 3. Preserve. At this time, the clutch is in a disengaged state similar to the neutral position. Next, when the valve moves beyond the intermediate position from the lower position to the upper position, the relief passage 17 is closed, and the hydraulic control valve 25, which operates in the same manner as the electromagnetic pressure control valve 16, and the clutch hydraulic control valve 5 are brought into communication. In addition, the hydraulic control valve 25 and the passage 26 are communicated to control the clutch hydraulic control valve 5, and the pressure oil from the passage 18 is guided to the right side operation boat of the switching valve 14 through the passage 19, and the hydraulic oil control valve 25 and the passage 26 are communicated with each other. The spool is moved to the left in the figure and the check valve 13 is pushed up to supply the flowing pressure oil from the oil pump to the clutch connection side chamber 11 via the circuit 15 to engage the clutch.

On the other hand, transmission manual control valve 2
7 is the selection cylinder 20 for neutral
boat CB and passage 29B, boat CC and passage 29C are turned off, and boat CI of shift cylinder 21 is turned off.
1 and passage 29D, boat CE and passage 29E are turned on. As a result, the vehicle is shifted from, for example, the fifth gear to the neutral position.

Next, when shifting to the first gear, the neutral position between the first and second gears is selected by turning on the boat CB and passage 29B of the selection cylinder 20, and the boat CC and passage 29C, and the shift Cylinder 2 ■ Boat CD
and passage 290 ONL, BO) CE and passage 29E OF
By pressing F, the vehicle enters 1st gear. Also, when changing from 1st gear to neutral, select cylinder 2
0 boat CB and passage 29B, boat CC and passage 29C
and ONt, boat C port of shift cylinder 2 construction and passage 290. By turning on the boat CE and the passage 29E, the first gear becomes neutral, and furthermore, the boat CB of the selection cylinder 20 and the passage 29B are turned off.
, the reverse position is selected by turning on the boat CC and passage 29C, and in this state, the shift cylinder 21
By turning off boat CD and passage 290 and turning on boat CE and passage 29E, the gear is shifted to reverse gear.

<Effects of the Invention> As described above, according to the present invention, even if a failure occurs in the electrical control system and the various solenoid valves that control the pressure oil become inoperable, the pressure oil can be stopped by manually operating the manual control valve for the clutch. After preventing the pressure drop, the clutch engages and disengages,
By manually operating the manual control valve for the transmission, the vehicle can be placed in both first gear and reverse gear, which has the advantage of improving safety by allowing self-propulsion in emergencies.

[Brief explanation of drawings]

The drawing shows the pressure oil i! of a hydraulically controlled clutch/transmission that uses the device of the present invention. It is an IH circuit diagram. 1...Pump, 2.3...Pressure oil supply passage, 5...
Clutch hydraulic control valve, 8...Clutch control cylinder, 14...Switching valve, 16...Electromagnetic pressure control valve, 20
...Cylinder for selection, 21...Cylinder for shift, 24...Manual control valve for latch, 2
7...Manual control valve for transmission, vA, VB, VC...Solenoid select valve, VD, VE
-...Solenoid shift valve. Patent applicant Outside Hino Motors Co., Ltd. 1
given name

Claims (1)

[Claims] The pressure oil discharged from the oil pump is divided into the clutch control cylinder side and the transmission control cylinder side, and on the clutch side, the pressure oil is switched between the clutch disconnection chamber side and the clutch connection chamber side of the clutch control cylinder. It is equipped with a switching valve that supplies the switching valve, a clutch oil pressure control valve that switches and controls this switching valve, and an electromagnetic pressure control valve that controls this clutch control valve, and the transmission side has a select cylinder and a shift cylinder that supply the pressure oil. In a hydraulically controlled clutch/transmission equipped with electromagnetic control valves for supplying and discharging, a clutch manual control valve is provided on the clutch side to open and close the clutch hydraulic control valve and to switch and control the switching valve, and the clutch manual control valve is provided on the transmission side. A transmission manual control valve for shifting to at least a first gear position and a reverse gear position is provided between the pressure oil supply passage from the oil pump and the pressure oil supply and discharge passages of the select cylinder and shift cylinder. An emergency control device for a hydraulically controlled clutch/transmission characterized by: